Added a test for the imagePath option. The image-url() function should prepend a user-configurable image path.
Implemented the imagePath option, for use with the image-url() function.
Added the imagePath option to the README.
Added the --image-path option to the cli interface.
Added the image_path option to the middleware.
Merge pull request #224 from steveluscher/imagePath

Implemented the image_path option